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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 534 $ 482
Prepaid expenses and other current assets, VIEs 54 43
Property, plant and equipment, net of accumulated depreciation, VIEs 2,494 2,572
Other long-term assets, VIEs 145 141
Current liabilities:    
Accounts payable, VIEs 356 334
Other current liabilities, VIEs 217 208
Long-term liabilities:    
Deferred income taxes, VIEs 394 386
Other long-term liabilities, VIEs $ 13 $ 9
Equity:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 350,000,000 350,000,000
Common stock, issued (in shares) 86,929,660 86,929,660
Treasury stock (in shares) 98,610 98,610
Variable Interest Entities    
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 286 $ 223
Accounts receivable of VIEs, allowance for doubtful accounts 1 1
Prepaid expenses and other current assets, VIEs 42 30
Property, plant and equipment, net of accumulated depreciation, VIEs 2,478 2,548
Other long-term assets, VIEs 135 137
Current liabilities:    
Accounts payable, VIEs 353 329
Other current liabilities, VIEs 130 181
Long-term liabilities:    
Deferred income taxes, VIEs 1 1
Other long-term liabilities, VIEs $ 8 $ 4